请问几个高中英语单选题,请英语大神瞧瞧

题目

请问几个高中英语单选题,请英语大神瞧瞧
1.-Alice,why aren't you at work today?
-I _______a day off.
A.have given B.have been given C.gave D.was given
我选的D
2.Unless he ______the place before,he won't introduce it to us in such detail.
A.has visited B.visits c.visited D.was visiting
我选的C
3.I got there at 10 o'clock,but she_____30minutes earlier than me.
A.has arrived Bhad arrived C.would arrive D.was arriving
我选的A

答案

1.问的是今天,是现在时,因为已经请过了假,所以用完成时.
没有过去时的时间标志,不能选D
2.有before可以是过去时也可以是完成时,主句中用的是将来,所以用现在完成时
3.过去的过去用过去完成时
我到这里是10点（这里是过去时）,她比我早30分钟（显然是在我之前到的）